Piston ring



April 22, 192.0. J. MAGEE 1,755,402

PISTON RING Filgd Jan. 9, 1929 i /ska INVENTOR ATTORNEYS Patented Apr. 22, 1930 JOHN MAGEE, OF DETROIT, MICHIGAN PISTON RING Application filed January 9, 1929. Serial- No. 331,272.

The invention relates to piston rings and more particularly to the type of ring designated as an oil control ring.

The object of the invention is to provide an improved construction adapted to better perform the functions of an oil control ring and so designed as to lend itself readily to com mercial production.

Another object is to construct an oil control ring in such a way as to prevent the formation Y of carbon in the slots extending through the mug.

These and other objects are attained by providing the novel construction hereinafter more fully described'and'illustrated in the accompanying drawings, wherein Figure 1 .is a side viewof the ring show-. ing the joint between the free ends thereof;

igure 2 is another side view of the ring 100 ing directly toward one of the slots in the ring;

Figure 3 is a view through the middle section of the ring, a portion being illustrated in elevation;

Figure 4 is a of Figure 3;

Figure 5 is a of Figure3; t

Figure 6 is a side view of the ring arranged to illustrate the arrangement of the slots therein.

The piston ring 10, as illustrated in the acc'ompanying drawings, is of the usual split type having a suitable lap joint between the free ends of the ring which, as shown. comprise the cooperating. step portions 11 and- 12. In cross section the ring is of generally rectangular shape,as shown in Figure 4, the upper outer edgebeing preferably beveled at 13. Between the upper and lower faces 14 and 15 ofthe ring are arranged a series of slots 16.which are constructed in such a manner as to impart particularly desirable characteristics to the ring. The slots 16 start 45 at a point adjacent to the split ends of the cross section on the line 4-4 other section on the line 55 j acent the ends,

ring and continue around the ring, in a contlnuous ser1es. Each slot has an upper plane surface 17 extending perpendicularly tothe outer cylindrical face 18. of the ring. The lower face 19 of each slot is also a plane and 5 extends at an angle to the outer face of the ring as indicated in Figure 5. The slot in cross section gives the appearance of a wedge. 21 represents the bottom surface which extends as a chord across the'circular ring and intersects the inner cylindrical wall 20 to form a perforation 22.- The walls 21 of adjacent slots are arranged to intersect at a point within the outer periphery of the ring as indicated at 23, thereby serving to connect the two adjacent slots with a groove as clearly indicated in Figure 4. In other words, the adjacent slots 16 slightly overlap to form a connecting groove 24. It will be observed that while the bottom surface 19 of each slot is a plane surface, the lineof intersection 25 with the outer periphery 18 of the ring is a curved line as shown in Figures 2 and 6. 7 The slots 16 are symmetrically arranged around the periphery of the ring and in the construction illustrated there are eight slots all overlapping to form connecting grooves.

The slots adjacent the split 'ends of the ring 7 do not overlap but terminate at the points 27 and 28, respectively, leaving unslotted p0 r tions 29 and 30. For this reason the groove which encircles the entire circumference of the ring, except for the split ends, is sealed ad- 0 thus preventing leakage at this point. The upper surfaces 17 of the slots being at an angle of 90 with the outer cylindrical surface 18 present a sharp edge to the cylinder wall causing the surplus oil on the walls of the cylinder to be scraped off on the downward stroke of the piston. The arrangement of the bottom wall 19 of the slots at an angle of less than with the outer peripheral surface is particularly ad- 90 vantageous for the reason that this construction eliminates carbonin the ring slots and readily redistributes the accumulated oil to thecylinder walls.

What I claim as my, invention is:

' 1.-A piston ring provided with a series of circumferentially spaced slot-s overlapping at the-outer wall of the ring to form a continuous circumferential groove.

2'. A piston ring provided with a series of circumferentially spaced slots overlapping at the outer wall of the ring to form a continuous circumferential groove, said slots extending through the inner wall of the ring to form a series of apertures.

3. A piston ring provided with a series of circumferentially spaced slots overlapping at the outer wall of the ring to form a continuous circumferential groove, said slots having diverging boundary walls.

4:. A piston ring provided with a series of circumferentially spaced slots overlapping at the outer wall of the ring to form a continuous circumferential groove, the upper surface of each of said slots being parallel to the faces of the ring and the lower surface of each slot extending at an angle to the upper surface.

5. A piston ring provided with circumferentially spaced slots overlapping at the outer wall of the ring to form a continuous circumferential groove, the upper su face of eachslot extending at an angle of 90 to the outer surface of the ring and the lower surface of each slot extending at an angle less than 90 to said outer surface.

6. A piston ring provided with a series of circumferentially spaced slots overlapping at the outer wall of the ring to form a continuous circumferential groove, said slots having flat bottom portions extending across the are a series of each slot having a lower surface lying in a plane'extending at an acute angle to the plane of the upper surface, each groove alsohaving a-flat-bottom surface, the bottom surfaces, of ad acent slots intersecting within the periphery of saidring forming a continuous groove, each slot intersecting the inner periphery of said ring to form an aperture through the r ng and the slots at the split ends of said rings terminating at a point spaced from the ends of said ring.

In testimony whereof I affix m signature;

JOHN AGEE.

of said ring and intersecting the inner surface,of said ring to form apertures through the ring.

7. A piston ring having-a series of slots in the outer cylindrical wall, said slots having adjacent slots intersecting at a point withmthe outer circumference of the ring, thereby forming a continuous groove around 1 said rmg.

9. A piston ring having a series of slots in the outer cylindrical wall thereof, each slot having a, flat upperlsurface extending at an angle of 90 with the outer wall of the ring, 

